mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-27 05:23:34 +00:00
56 lines
2.2 KiB
C
56 lines
2.2 KiB
C
|
#ifndef _LINUX_BUG_H
|
||
|
|
#define _LINUX_BUG_H
|
||
|
|
|
||
|
|
#include <linux/compiler.h>
|
||
|
|
|
||
|
|
#ifdef __CHECKER__
|
||
|
|
#define BUILD_BUG_ON_NOT_POWER_OF_2(n) (0)
|
||
|
|
#define BUILD_BUG_ON_ZERO(e) (0)
|
||
|
|
#define BUILD_BUG_ON_NULL(e) ((void*)0)
|
||
|
|
#define BUILD_BUG_ON_INVALID(e) (0)
|
||
|
|
#define BUILD_BUG_ON(condition) (0)
|
||
|
|
#define BUILD_BUG() (0)
|
||
|
|
#else /* __CHECKER__ */
|
||
|
|
|
||
|
|
/* Force a compilation error if a constant expression is not a power of 2 */
|
||
|
|
#define BUILD_BUG_ON_NOT_POWER_OF_2(n) \
|
||
|
|
BUILD_BUG_ON((n) == 0 || (((n) & ((n) - 1)) != 0))
|
||
|
|
|
||
|
|
/* Force a compilation error if condition is true, but also produce a
|
||
|
|
result (of value 0 and type size_t), so the expression can be used
|
||
|
|
e.g. in a structure initializer (or where-ever else comma expressions
|
||
|
|
aren't permitted). */
|
||
|
|
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
|
||
|
|
#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* BUILD_BUG_ON_INVALID() permits the compiler to check the validity of the
|
||
|
|
* expression but avoids the generation of any code, even if that expression
|
||
|
|
* has side-effects.
|
||
|
|
*/
|
||
|
|
#define BUILD_BUG_ON_INVALID(e) ((void)(sizeof((__force long)(e))))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* BUILD_BUG_ON - break compile if a condition is true.
|
||
|
|
* @condition: the condition which the compiler should know is false.
|
||
|
|
*
|
||
|
|
* If you have some code which relies on certain constants being equal, or
|
||
|
|
* some other compile-time-evaluated condition, you should use BUILD_BUG_ON to
|
||
|
|
* detect if someone changes it.
|
||
|
|
*
|
||
|
|
* The implementation uses gcc's reluctance to create a negative array, but gcc
|
||
|
|
* (as of 4.4) only emits that error for obvious cases (e.g. not arguments to
|
||
|
|
* inline functions). Luckily, in 4.3 they added the "error" function
|
||
|
|
* attribute just for this type of case. Thus, we use a negative sized array
|
||
|
|
* (should always create an error on gcc versions older than 4.4) and then call
|
||
|
|
* an undefined function with the error attribute (should always create an
|
||
|
|
* error on gcc 4.3 and later). If for some reason, neither creates a
|
||
|
|
* compile-time error, we'll still have a link-time error, which is harder to
|
||
|
|
* track down.
|
||
|
|
*/
|
||
|
|
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))
|
||
|
|
|
||
|
|
#endif /* __CHECKER__ */
|
||
|
|
|
||
|
|
#endif /* _LINUX_BUG_H */
|